Can genetic testing be done using sperm, to tell if that sperm contains any de novo single gene mutation or any other types of mutation?

No: The genetic testing happen to embryo not sperms

Hard to see value: You would have no guarantee any other sperm would have a that or a similar mutation. It could never survive the testing and be used to create a pregnancy if it were "good".The benefit of having so many sperm released during intercourse is the healthiest ones are able to swim faster and fertilize first.